Substrate-Integrated MEMS Resonator Layout for Compact Clock Routing
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Solution Overview
Problem
Existing resonators in electronic devices are typically large and separate from semiconductor dies, occupying valuable space and requiring separate packaging, which is not suitable for miniaturized devices.
Innovation Solution
Incorporating microelectromechanical systems (MEMS) resonators within the substrate of electronic devices, such as glass or quartz substrates, reduces size and eliminates the need for separate packaging by integrating them with semiconductor dies, using vias for connections and potentially including temperature sensors for compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resonators are coupled to circuit board adjacent to semiconductor die, then resonators can be easily connected to processors, but device size increases and manufacturing complexity increases
Solution Approach 1:
The patent merges the resonator and semiconductor die into a single integrated device structure. The resonator is formed within the same semiconductor substrate as the die, eliminating the need for separate coupling to the circuit board. This integration maintains electrical connection ease through shared substrate routing while dramatically reducing device size by eliminating separate resonator packaging and mounting space.
Solution Approach 2:
The resonator structure is nested within the semiconductor substrate alongside the die. The resonator occupies space within the same substrate volume rather than requiring external mounting. This nesting approach allows both components to coexist in a compact arrangement, reducing overall device footprint while maintaining functional separation.
2Ease of operation
If resonators are coupled to circuit board adjacent to semiconductor die, then resonators can be easily connected to processors, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines resonator fabrication with semiconductor die manufacturing into a single integrated process flow. Both components are formed using the same semiconductor fabrication techniques on the same substrate, eliminating separate resonator packaging, testing, and mounting operations. This merger simplifies manufacturing while maintaining electrical connectivity through standard substrate routing.
Solution Approach 2:
The semiconductor substrate serves multiple functions simultaneously: it acts as both the die substrate and the resonator substrate. The same fabrication equipment and processes used for die manufacturing are also used for resonator formation, achieving multi-functionality that reduces manufacturing complexity and eliminates the need for separate resonator production lines.
3Volume of moving object
If resonators are integrated within substrate below processor die, then device size is reduced and manufacturing is simplified, but routing distances and parasitics must be minimized
Solution Approach 1:
The patent positions the resonator in the vertical dimension below the processor die rather than placing it laterally adjacent on the circuit board. This vertical integration within the substrate thickness reduces the horizontal routing distance to near-zero while utilizing the third dimension for component placement. The short vertical interconnects through the substrate minimize parasitic inductance and capacitance compared to traditional lateral routing.
Solution Approach 2:
The resonator and die share the same substrate environment and electrical interconnection infrastructure. By merging their locations within the same substrate volume, the patent eliminates long external routing traces that would introduce parasitics. The shared substrate provides a common reference plane and minimizes signal path length, reducing electromagnetic interference and parasitic effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This integration reduces the overall device size, minimizes parasitics, and enables high-frequency clock signals, while simplifying manufacturing and reducing routing distances between processors and resonators.
Implementation Method 1
a piezoelectric layer over the first electrode layer
Data Source
AI summary
An electronic device and associated methods are disclosed. In one example, the electronic device includes a MEMS die located within a substrate, and below a processor die. In selected examples, the MEMS die includes a resonator. Example methods of forming MEMS resonator devices are also shown.